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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
calculations 2moa off, need advice
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<blockquote data-quote="goose" data-source="post: 398836" data-attributes="member: 14402"><p>shooting a 270 win, 22" bbl 130gr sierra sbt 54gr of rl 17. I have vel. from 4 or 5 groups of 5 shots. the groups have sd of 12 to 25 and average from 2915fps to 2980fps from the slowest group to the fastest. The chrony is about 20-25' from the muzzle. The shots at distance were after 7 or 8 shots post cleaning. Sight height is about 1.6 to 1.7 above the bore.</p></blockquote><p></p>
[QUOTE="goose, post: 398836, member: 14402"] shooting a 270 win, 22" bbl 130gr sierra sbt 54gr of rl 17. I have vel. from 4 or 5 groups of 5 shots. the groups have sd of 12 to 25 and average from 2915fps to 2980fps from the slowest group to the fastest. The chrony is about 20-25' from the muzzle. The shots at distance were after 7 or 8 shots post cleaning. Sight height is about 1.6 to 1.7 above the bore. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
calculations 2moa off, need advice
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